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Added a02.c02 Assembler

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Curtis F Kaylor 2020-04-15 10:55:30 -04:00
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/* C02 Assembler */
/* Address Modes */
enum {ABS, //Absolute
ABX, //Absolute,X
ABY, //Absolute,Y
ACC, //Accumulator
IDX, //(Indirect,X)
IIY, //(Indirect),Y
IMD, //Immediate
IMP, //Implied
IND, //Indirect
REL, //Relative
ZPG, //Zero Page
ZPX, //Zero Page,X
ZPY, //Zero Page,X
}
/* Op Code Indexes */
enum {ADC, AND, ASL, BCC, BCS, BEQ, BIT, BMI, BNE, BPL, BRK, BVC, BVS, CLC,
CLD, CLI, CLV, CMP, CPX, CPY, DEC, DEX, DEY, EOR, INC, INX, INY, JMP,
JSR, LDA, LDX, LDY, LSR, NOP, ORA, PHA, PHP, PLA, PLP, ROL, ROR, RTI,
RTS, SBC, SEC, SED, SEI, STA, STX, STY, TAX, TAY, TSX, TXA, TXS, TYA};
/* Op Code Mnemonic Lists */
const char mnelst = {"ADC AND ASL CMP CPX CPY DEC EOR INC JMP JSR LDA LDX LDY LSR ORA ROL ROR SBC STA STX STY "};
const char implst = {"BRK CLC CLD CLI CLV DEX DEYINX INY NOP PHA PHP PLA PLP RTI RTSSEC SED SEI TAX TAY TSX TXA TXS TYA "};
const char rellst = {"BCC BCS BEQ BMI BNE BPL BVC BVS "};
/* Op Code Lookup Tables */
const char ocilst = {//x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
#BRK, #ORA, 255, 255, 255, #ORA, #ASL, 255, #PHP, #ORA, #ASL, 255, 255, #ORA, #ASL, 255, //0x
#BPL, #ORA, 255, 255, 255, #ORA, #ASL, 255, #CLC, #ORA, 255, 255, 255, #ORA, #ASL, 255, //1x
#JSR, #AND, 255, 255, #BIT, #AND, #ROL, 255, #PLP, #AND, #ROL, 255, #BIT, #AND, #ROL, 255, //2x
#BMI, #AND, 255, 255, 255, #AND, #ROL, 255, #SEC, #AND, 255, 255, 255, #AND, #ROL, 255, //3x
#RTI, #EOR, 255, 255, 255, #EOR, #LSR, 255, #PHA, #EOR, #LSR, 255, #JMP, #EOR, #LSR, 255, //4x
#BVC, #EOR, 255, 255, 255, #EOR, #LSR, 255, #CLI, #EOR, 255, 255, 255, #EOR, #LSR, 255, //5x
#RTS, #ADC, 255, 255, 255, #ADC, #ROR, 255, #PLA, #ADC, #ROR, 255, #JMP, #ADC, #ROR, 255, //6x
#BVS, #ADC, 255, 255, 255, #ADC, #ROR, 255, #SEI, #ADC, 255, 255, 255, #ADC, #ROR, 255, //7x
255, #STA, 255, 255, #STY, #STA, #STX, 255, #DEY, 255, #TXA, 255, #STY, #STA, #STX, 255, //8x
#BCC, #STA, 255, 255, #STY, #STA, #STX, 255, #TYA, #STA, #TXS, 255, 255, #STA, 255, 255, //9x
#LDY, #LDA, #LDX, 255, #LDY, #LDA, #LDX, 255, #TAY, #LDA, #TAX, 255, #LDY, #LDA, #LDX, 255, //Ax
#BCS, #LDA, 255, 255, #LDY, #LDA, #LDX, 255, #CLV, #LDA, #TSX, 255, #LDY, #LDA, #LDX, 255, //Bx
#CPY, #CMP, 255, 255, #CPY, #CMP, #DEC, 255, #INY, #CMP, #DEX, 255, #CPY, #CMP, #DEC, 255, //Cx
#BNE, #CMP, 255, 255, 255, #CMP, #DEC, 255, #CLD, #CMP, 255, 255, 255, #CMP, #DEC, 255, //Dx
#CPX, #SBC, 255, 255, #CPX, #SBC, #INC, 255, #INX, #SBC, #NOP, 255, #CPX, #SBC, #INC, 255, //Ex
#BEQ, #SBC, 255, 255, 255, #SBC, #INC, 255, #SED, #SBC, 255, 255, 255, #SBC, #INC, 255 //Fx
}
const char admlst = {//x0 x1 x2 x3 x4 x5 x6 x7 x8 x9 xA xB xC xD xE xF
#IMP, #IDX, 255, 255, 255, #ZPG, #ZPG, 255, #IMP, #IMD, #ACC, 255, 255, #ABS, #ABS, 255, //0x
#IMP, #IIY, 255, 255, 255, #ZPX, #ZPX, 255, #IMP, #ABY, 255, 255, 255, #ABX, #ABX, 255, //1x
#IMP, #IDX, 255, 255, #ZPG, #ZPG, #ZPG, 255, #IMP, #IMD, #ACC, 255, #ABS, #ABS, #ABS, 255, //2x
#IMP, #IIY, 255, 255, 255, #ZPX, #ZPX, 255, #IMP, #ABY, 255, 255, 255, #ABX, #ABX, 255, //3x
#IMP, #IDX, 255, 255, 255, #ZPG, #ZPG, 255, #IMP, #IMD, #ACC, 255, #ABS, #ABS, #ABS, 255, //4x
#IMP, #IIY, 255, 255, 255, #ZPX, #ZPX, 255, #IMP, #ABY, 255, 255, 255, #ABX, #ABX, 255, //5x
#IMP, #IDX, 255, 255, 255, #ZPG, #ZPG, 255, #IMP, #IMD, #ACC, 255, #IND, #ABS, #ABS, 255, //6x
#IMP, #IIY, 255, 255, 255, #ZPX, #ZPX, 255, #IMP, #ABY, 255, 255, 255, #ABX, #ABX, 255, //7x
255, #IDX, 255, 255, #ZPG, #ZPG, #ZPG, 255, #IMP, 255, #IMP, 255, #ABS, #ABS, #ABS, 255, //8x
#IMP, #IIY, 255, 255, #ZPX, #ZPX, #ZPY, 255, #IMP, #ABY, #IMP, 255, 255, #ABX, 255, 255, //9x
#IMD, #IDX, #IMD, 255, #ZPG, #ZPG, #ZPG, 255, #IMP, #IMD, #IMP, 255, #ABS, #ABS, #ABS, 255, //Ax
#IMP, #IIY, 255, 255, #ZPX, #ZPX, #ZPY, 255, #IMP, #ABY, #IMP, 255, #ABX, #ABX, #ABY, 255, //Bx
#IMD, #IDX, 255, 255, #ZPG, #ZPG, #ZPG, 255, #IMP, #IMD, #IMP, 255, #ABS, #ABS, #ABS, 255, //Cx
#IMP, #IIY, 255, 255, 255, #ZPX, #ZPX, 255, #IMP, #ABY, 255, 255, 255, #ABX, #ABX, 255, //Dx
#IMD, #IDX, 255, 255, #ZPG, #ZPG, #ZPG, 255, #IMP, #IMD, #IMP, 255, #ABS, #ABS, #ABS, 255, //Ex
#IMP, #IIY, 255, 255, 255, #ZPX, #ZPX, 255, #IMP, #ABY, 255, 255, 255, #ABX, #ABX, 255 //Fx
}
char aa,ii,xx,yy; //Function Variables
char ss[4];
int yx;
/* Lookup Op Code Index Mnemonic *
* Args: int Address of String *
* char Address Mode *
* Rets: char Op Code Index *
* $FF = Not Found */
char lkupmi(yx) {
aa = strlen(yx); //Get Length of Mnemonic
if (ii <> 3) //If Not 3
return $FF; // Return Not Found
setdst(ss); //Copy Mnemonic
strcpy(yx); //to SS
strapd(' '); //and Append a Space
setdst(mnelst); //Return Position of
return strstr(ss); //ss[] in mnelst[]
}
/* Lookup Op Code *
* Args: char Opcode Index *
* char Address Mode *
* Rets: char Op Code *
* $FF = Not Found */
char lkupoc(aa, yx) {
ii = 0;
do {
if (ocilst[ii] == aa and admlst[ii] == yy) return ii;
ii++;
} while (ii);
return $FF; //Opcode Not Found
}